Pressure operated throttling valve



Dec. 8, 1942- l. E. WIEGERS PRESSURE OPERATED THROTTLING VALVE Filed May 20, 1941 FIG. 1

l WINVENTOR.

Patented Dec. 8,1942

UNITED STATES "PATENT OFFICE 2,304,323 PRESSURE OPERATED THROTTLING VALVE v Irvin E. Wiegers, Overland, M0. Application May 20, 1941, Serial No. 394,297

4 Claims.

My invention relatesto improvements in pressure operated valves of the throttling type in which the main valve is energized by the pressure of the fluid which it is controlling. One object of the invention is to provide a valve in which the valve movement is' greater than is attained by valves which respond to movements of a flexing means such as a diaphragm or bellows but retains throttling action. Another object is to make valve movement relatively independent of the effects of friction. These ob- .jects can be obtained by the mechanisms illustrated in the accompanying drawing.

Figure 1 illustrates a mechanism in which valve opening increases upon increase of control pressure above the opening point. Figure 2 shows the arrangement of pilot valve and seat which is preferably centralized over piston II to attain an increase in valve opening upon decrease of control pressure below the opening point.

In Figure 1 the fluid whose flow is to be controlled enters the valve through the opening 22 to the inlet chamber 2. This fluid is transmitted at inlet pressure through passage 3 to pilot valve seat port, 4. The pilot valve 5 is energized by the force of the control pressure in chamber 28.

formed by flexing means I9 and cover when the force on the bufl'er plate l8 due to said pressure is greater than the force due to spring I] whose force is adjustable by means of nut l6. Butler plate i8 is preferably securely fastened to stem 2| which transmits motion to pilot valve 5. Opening of the pilot valve 5 will cause the pressure of the fluid whose flow is to be controlled to be transmitted to chamber 26 and to fall upon the piston H whose area is greater than mainvalve port 29. Valve disc H, which is guided by pronged guide l3 and assembled to piston H by means of retaining plate and nut We, will be forced open until the force of spring H), which is secured to the piston II by screw l2 and transmitted to pilot valve 5 by means of lever 1 and fulcrum 6, is sufficient to counterbalance the excess force of pressure in chamber 28 over force of spring I'I'causing pilot valve 5 to assume a throttling position. By this means the movement of the disc M from seat port 29 is made proportional to excess of force of control pressure upon flexing means I9 over force of spring ll, so long as pressure in inlet chamber 2 exceeds pressure in outlet chamber 24 by an amount suflicient to operate valve Hi. The proportion of main valve opening to said force difierence can be varied by changingthe rate of spring l0 and/or by shifting fulcrum 6 relative to points of application of forces on lever 1. Main valve 14 can also be made to move freely thrdugh a fixed distance before assuming a throttling position by adjusting pointat which spring l0 becomes active.

The above'description will also apply to the mechanism suggested in Figure 2.except that valve opening will be affected by excess of force of spring I! over force of control pressure onflexing means l9.

Control pressure is transmitted to chamber till through opening 21. A seal is obtained between valve body I and cover 8 by means of gasket 9 and suitable fastening. Outlet torlthe valve is provided by opening 23. Membrane or packing I5 provides seal around stem 2!.

It is likely that in some-applications of this Iinvention dash-pots attached to pilot valve or to piston or to both will be desirable to eliminate chattering or water hammer.

The control pressure referred to in this specification might be supplied by a volatile charge,

a pneumatic thermostat, a vapor to be heated or cooled, or may be the pressure of the fluid to be controlled, but the invention is not limited to these uses.

It is to be understood that there is suillcient leakage around the edge of piston ii "to allow the valve M to close when pilot valve 5 closes.

Where a membrane is used instead of piston. il

a vent would be provided.

What I claim is: I 1. In a valve of tne character described, a

valve casing having an inlet chamber, a main valve member in said inlet chamber, a discharge chamber, a valve port. connecting said inlet chamber to said discharge chamber controlled by said main valve member, vented piston means in said discharge chamber operatively connected to said main valve member, said piston means forming a power chamber with said casing, passageway from said inlet chamber to said power chamber through a wall of said casing, apilot valve member controlling said passageway, said pilot valve member having'a resilient connection to said piston means so that motion of main valve member toward open position urges pilot valve member toward closed position.

2. In a valve of the character described, a valve casing having an inlet chamber, a main valve member in said inlet chamber, a discharge cham- 2- main valve member, said piston means forming a power chamber with said casing, passageway from said inlet chamber .to said power chamber through a wall of said casing, a pilot valve member controlling said passageway, said pilot valve member being operatively connected to a pressure responsive means and having a resilient connection to said piston means. I

3. In a valve of the character described, a valve casing having aninlet chamber and an outlet chamber, a main valve member controlling a port between said chambers, vented piston means energized by the pressure of the fluid passing through the valve operatively con nected to said main valve member, said piston means forming a power chamber with a wall of said casing, passageway through said casing wall communicating with said power chamber, a

pilot valve member controlling said passageway, said pilot valve member being operatively connected to a pressure responsive means and having a resilient connection to said piston means.

4. In a valve of the character described, a,

valve casing having an inlet chamber, an outlet chamber, a main valve member controlling a port I v sure responsive means and having a resilient connection to said piston means.

IRVIN E. WIEGERS. 

